They always seem so chill in photos but I’ve worked with them and they’re one of the most skittish animals I’ve dealt with, the tapir they lived with was always wanting scratches though
Running one’s tests from the perspective of a user allows for high level test-driven development. Whenever a red is too complex to green without thinking, one can drop down to unit level to drive out the details.
It’s a little less efficient during runs, so long term a set of units developed emergent bugs should become the meat of the suite.